A conductor of length l is connected to a.d.c., source of potential V. if the length of the conductor is tripled by stretching it, keeping V constant, explain how to the following factors vary in the conductor?
(i) Drift speed of electrons
(ii) Resistance
(iii) Resistivity.

Explanation

To solve the problem, we need to analyze how the drift speed of electrons, resistance, and resistivity change when the length of a conductor is tripled while keeping the potential difference (V) constant.

### Step-by-Step Solution:

1. **Understanding Drift Speed of Electrons (v_d)**:
- The drift speed of electrons is given by the formula:
\[
v_d = \frac{I}{nAe}
...